US Bridges

SH 29 over South San Gabriel River

Good

Williamson County, Texas · 0.4 MI E of IH 35 · Structure no. 142460033701005

Built
1938
87 years old, rebuilt 1997
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
303 ft
3 main spans
Daily traffic
28,427
2023 count
Owner
State
State Highway Agency

About this bridge

SH 29 over South San Gabriel River is a prestressed concrete stringer/multi-beam or girder carrying SH 29 over South San Gabriel River in Williamson County, Texas. It was built in 1938 and reconstructed in 1997, so it is 87 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 28,427 vehicles a day, roughly 3% of them trucks, projected to reach 30,919 by 2041. The structure is 303 ft (92.4 m) long and 79 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSH 29
CrossesSouth San Gabriel River
Location0.4 MI E of IH 35
RouteState Highway 29
StateTexas
Coordinates30.63318, -97.68471
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length303 ft (92.4 m)
Longest span102 ft (31.1 m)
Deck width79 ft (24.1 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,427 (2023)
Projected traffic30,919 by 2041
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 29 over South San Gabriel River built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1997.

What condition is SH 29 over South San Gabriel River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.

How much traffic does SH 29 over South San Gabriel River carry?

About 28,427 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SH 29 over South San Gabriel River?

The structure is 303 ft (92.4 m) long with a longest span of 102 ft (31.1 m) and a deck 79 ft wide.

Who owns SH 29 over South San Gabriel River?

It is owned by the State Highway Agency.